Comparison : Item # AD-1B, Crushed Walnut Shell, Organic Abarsive, 6/10
Item # AD-2.5B, Crushed Walnut Shell, Organic Abarsive, 8/12
Item # AD-3B, Crushed Walnut Shell, Organic Abarsive, 12/20
Item # AD-4B, Crushed Walnut Shell, Organic Abarsive, 14/30
Item # AD-6B, Crushed Walnut Shell, Organic Abarsive, 18/40